INGREDIENTS
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2 Tbsp butter
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2 Tbsp olive oil
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2 onions, thinly sliced
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1/4 cup flour
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3 cups heavy cream
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2 cups milk
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Salt & pepper, to taste
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1 tsp nutmeg
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4 lbs Yukon Gold potatoes, skin on & sliced 1/8'' thick
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1-1/2 cups white Cheddar cheese, shredded
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1-1/2 cups Fontina cheese, shredded
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1/2 cups Parmesan cheese, grated
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4-5 sprigs fresh thyme